OverridesSpecEx.java revision 1465:b52a38d4536c 
1/*
2 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug     6453386
27 * @summary Verify that example code in Elements.overrides works as spec'ed.
28 * @author  Scott Seligman
29 * @library /tools/javac/lib
30 * @build JavacTestingAbstractProcessor
31 * @compile -g OverridesSpecEx.java
32 * @compile -processor OverridesSpecEx -proc:only OverridesSpecEx.java
33 */
34
35import java.util.Set;
36import javax.annotation.processing.*;
37import javax.lang.model.SourceVersion;
38import javax.lang.model.element.*;
39import javax.lang.model.type.*;
40import javax.lang.model.util.*;
41
42import static javax.lang.model.util.ElementFilter.*;
43
44public class OverridesSpecEx extends JavacTestingAbstractProcessor {
45    public boolean process(Set<? extends TypeElement> annoTypes,
46                           RoundEnvironment round) {
47        if (!round.processingOver())
48            doit(annoTypes, round);
49        return true;
50    }
51
52    private void doit(Set<? extends TypeElement> annoTypes,
53                      RoundEnvironment round) {
54        TypeElement string = elements.getTypeElement("java.lang.String");
55        TypeElement object = elements.getTypeElement("java.lang.Object");
56
57        ExecutableElement m1 = null;
58        ExecutableElement m2 = null;
59        for (ExecutableElement m : methodsIn(string.getEnclosedElements())) {
60            if (m.getSimpleName().contentEquals("hashCode")) {
61                m1 = m;
62                break;
63            }
64        }
65        for (ExecutableElement m : methodsIn(object.getEnclosedElements())) {
66            if (m.getSimpleName().contentEquals("hashCode")) {
67                m2 = m;
68                break;
69            }
70        }
71
72        boolean res =
73            elements.overrides(m1, m2, (TypeElement) m1.getEnclosingElement());
74        System.out.println("String.hashCode overrides Object.hashCode?  " + res);
75        checkResult(res);
76
77        TypeElement a = elements.getTypeElement("OverridesSpecEx.A");
78        TypeElement b = elements.getTypeElement("OverridesSpecEx.B");
79        TypeElement c = elements.getTypeElement("OverridesSpecEx.C");
80
81        m1 = null;
82        m2 = null;
83        for (ExecutableElement m : methodsIn(a.getEnclosedElements()))
84            m1 = m;
85        for (ExecutableElement m : methodsIn(b.getEnclosedElements()))
86            m2 = m;
87
88        res = elements.overrides(m1, m2, a);
89        System.out.println("A.m overrides B.m in B?  " + res);
90        checkResult(!res);
91        res = elements.overrides(m1, m2, c);
92        System.out.println("A.m overrides B.m in C?  " + res);
93        checkResult(res);
94    }
95
96    private static void checkResult(boolean truthiness) {
97        if (!truthiness)
98            throw new AssertionError("Bogus result");
99    }
100
101    // Fodder for the processor
102    class A {
103        public void m() {}
104    }
105    interface B {
106        void m();
107    }
108    class C extends A implements B {
109    }
110}
111